Error when component loading dynamic
DynamicBuilderComponent.ngfactory.js:198 ERROR Error: ExpressionChangedAfterItHasBeenCheckedError: Expression has changed after it was checked. Previous value: 'ng-pristine: true'. Current value: 'ng-pristine: false'.
Problem
after binding json in select2data to select2 component Angular throw exception.
component code
@Component({
changeDetection: ChangeDetectionStrategy.OnPush,
selector: 'select2',
Imported changeDetection in component.
template: `
<div [formGroup]="form">
<ng-container>
<ng-select2
[data]="select2data"
[options]="options"
[width]="500"
[formControlName]="field.code"
(keyup)="changed($event.target.value)">
</ng-select2>
</ng-container>
</div>`
})
select2 component class
export class Select2Component implements OnInit {
@Input() field: any = {};
@Input() form: FormGroup;
public exampleData: Array<Select2OptionData>;
public options: Options;
public value: string[];
select2data: any;
public selected: string;
constructor(public cl: Services,private cd: ChangeDetectorRef) {
this.options = {
width: '258',
multiple: true,
tags: false
};
}
Problem Area After Binding subscribe data in ng select2 component
changed(search: any) {
//call service pass search text to service
return this.cl.searchFunc(search).subscribe(
res1 =>
this.select2data = res1.data;
this.cd.markForCheck(); // marks path
}
}
},
error => {
console.log('error = ', error);
});
}
}
i tried to print this.select2data in console.log its return me json.
Vendor.js
function expressionChangedAfterItHasBeenCheckedError(context, oldValue, currValue, isFirstCheck) {
var msg = "ExpressionChangedAfterItHasBeenCheckedError: Expression has changed after it was checked. Previous value: '" + oldValue + "'. Current value: '" + currValue + "'.";
if (isFirstCheck) {
msg +=
" It seems like the view has been created after its parent and its children have been dirty checked." +
" Has it been created in a change detection hook ?";
}
return viewDebugError(msg, context);
}
Great Article
https://blog.thoughtram.io/angular/2016/02/22/angular-2-change-detection-explained.html
Reference
Expression ___ has changed after it was checked
I believe that you put your component select2
inside another component which contains a form which you then pass to select2
for create another <form>
tag, is that correct? I mean do you have something like that?
<form [formGroup]="form">
<!-- Some code -->
<select2 [field]="something" [form]="form"></select2>
</form>
If so, then your select2
component SHOULD NOT contain re-declaration of form, it should not contain anything related to forms at all. It should be a form control. Please read a post by Netanel Basal on how to create custom form controls. You will need to create ControlValueAccessor
for your select2
and wire it up to Angular forms through a custom provider.
The issue you're facing is that since you include form
object twice in the DOM data changes are propagated twice as well and you run into issues. There should be only one reference to a specific instance of FormGroup
in your templates.
Solution that worked
@Component({
changeDetection: ChangeDetectionStrategy.OnPush,
selector: 'select2',
export class Select2Component implements OnInit {
constructor(public cl: Services,private cd: ChangeDetectorRef) {
this.options = {
width: '258',
multiple: true,
tags: false
};
}
Binding function
changed(search: any) {
//call service pass search text to service
return this.cl.searchFunc(search).subscribe(
res1 =>
this.select2data = res1.data;
this.cd.markForCheck(); // marks path
this.cd.detectChanges();
}
}
},
error => {
console.log('error = ', error);
});
}
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